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Review
. 1998 Dec;106(12):775-92.
doi: 10.1289/ehp.98106775.

Toxic equivalency factors (TEFs) for PCBs, PCDDs, PCDFs for humans and wildlife

M Van den Berg  1 , L Birnbaum, A T Bosveld, B Brunström, P Cook, M Feeley, J P Giesy, A Hanberg, R Hasegawa, S W Kennedy, T Kubiak, J C Larsen, F X van Leeuwen, A K Liem, C Nolt, R E Peterson, L Poellinger, S Safe, D Schrenk, D Tillitt, M Tysklind, M Younes, F Waern, T Zacharewski
Affiliations
Review

Toxic equivalency factors (TEFs) for PCBs, PCDDs, PCDFs for humans and wildlife

M Van den Berg et al. Environ Health Perspect. 1998 Dec.

Abstract

An expert meeting was organized by the World Health Organization (WHO) and held in Stockholm on 15-18 June 1997. The objective of this meeting was to derive consensus toxic equivalency factors (TEFs) for polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) and dioxinlike polychlorinated biphenyls (PCBs) for both human, fish, and wildlife risk assessment. Based on existing literature data, TEFs were (re)evaluated and either revised (mammals) or established (fish and birds). A few mammalian WHO-TEFs were revised, including 1,2,3,7,8-pentachlorinated DD, octachlorinated DD, octachlorinated DF, and PCB 77. These mammalian TEFs are also considered applicable for humans and wild mammalian species. Furthermore, it was concluded that there was insufficient in vivo evidence to continue the use of TEFs for some di-ortho PCBs, as suggested earlier by Ahlborg et al. [Chemosphere 28:1049-1067 (1994)]. In addition, TEFs for fish and birds were determined. The WHO working group attempted to harmonize TEFs across different taxa to the extent possible. However, total synchronization of TEFs was not feasible, as there were orders of a magnitude difference in TEFs between taxa for some compounds. In this respect, the absent or very low response of fish to mono-ortho PCBs is most noticeable compared to mammals and birds. Uncertainties that could compromise the TEF concept were also reviewed, including nonadditive interactions, differences in shape of the dose-response curve, and species responsiveness. In spite of these uncertainties, it was concluded that the TEF concept is still the most plausible and feasible approach for risk assessment of halogenated aromatic hydrocarbons with dioxinlike properties.

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Comment in

  • The trouble with TEFs.
    Starr TB, Greenlee WF, Neal RA, Poland A, Sutter TR. Starr TB, et al. Environ Health Perspect. 1999 Oct;107(10):A492-3. doi: 10.1289/ehp.107-1566591. Environ Health Perspect. 1999. PMID: 10504157 Free PMC article.
  • Health effects of hexachlorobenzene and the TEF approach.
    Vos JG. Vos JG. Environ Health Perspect. 2000 Feb;108(2):A58. doi: 10.1289/ehp.108-a58a. Environ Health Perspect. 2000. PMID: 10656862 Free PMC article. No abstract available.

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